Legionella doesn’t require a “dirty” building to become a threat. It needs the right conditions: warm water, stagnation, biofilm/scale, and places that create aerosols. If your building has complex plumbing, intermittent use, or aerosol-producing equipment, you can have high-risk zones without realizing it.
A Legionella Risk Assessment identifies where Legionella is most likely to grow and spread—then gives you a prioritized plan to fix it.
The Problem: Legionella Risk Lives in the Blind Spots
Most facilities don’t struggle because they’re doing nothing. They struggle because risk is hiding in the details
If you can’t clearly point to your highest-risk locations and what controls protect them, you’re exposed.
Warm water temps drifting into the “growth-friendly” range
Low-flow outlets and dead legs creating stagnation
Biofilm/scale protecting bacteria from disinfectants
Equipment that aerosolizes water (cooling towers, showers, decorative features)
Documentation that doesn’t match real-world operations
Legionella is the most common cause of illness outbreaks linked to drinking water in the U.S.
That’s why water risk programs and risk management planning have become a major focus for large buildings and high-risk facilities.
We identify risk conditions such as stagnation points, temperature challenges, biofilm/scale indicators, and aerosol sources. We rank findings based on likelihood and consequence—so you’re not stuck with a long list and no direction.
We outline practical steps to reduce risk, which may include operational changes, cleaning/maintenance improvements, control targets, and disinfection recommendations.
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